81
Apps
Real
Time
Text
(RTT)
Type
back
and
forth
in
real
time
with
the
other
person
while
on
a
call.
You
can
use
RTT
whenever
you
are
calling
someone
whose
phone
also
supports
RTT
or
is
connected
to
a
teletypewriter
(TTY)
device.
The
RTT
icon
appears
on
all
incoming
RTT
calls.
1.
From
Phone
,
tap
More
options
>
Settings
.
2.
Tap
Real
time
text
for
the
following
options:
•
RTT
call
button
:
Choose
a
visibility
option
for
the
RTT
call
button.
•
Use
external
TTY
keyboard
:
Hide
the
RTT
keyboard
when
an
external
TTY
keyboard
is
connected.
•
TTY
mode
:
Choose
the
preferred
TTY
mode
for
the
keyboard
in
use.
NOTE
To
use
RTT,
you
must
be
connected
to
a
4G
LTE
or
Wi-Fi
network.
